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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF
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<br />FLOOD-PRONE AREAS
<br />
<br />BASALT QUADRANGLE
<br />COLORAOO
<br />7,5 MINUTE SERIES (TOPOGRAPHIC)
<br />327 uroo
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<br />Approximate boundaries of flood.pronf:' arl'US are Rhown on this map. There is, on the
<br />uvprage, about 1 chance in 100 that the df'sia-natt"d areas will be inundated in any year.
<br />This information is important to puhlic agencies and private citizens concerned with futurf>
<br />land developments.
<br />The flood-prom> area~ have been delineated through use of readily availah]e informa-
<br />tion on paiolt f1o~s rather than from detaih.d field surveys and inspections. In general.
<br />the delineated areas are for natural conditions and do not take into consideration the pos~
<br />sible eff('cts of existing or proposed flood control structures except whNe thoSt> e[f('cts
<br />could hi' evaluated. I<']ood areas havt. been identified for: (1) urhan areas "'here the up-
<br />stream drainage basin exceeds 25 square miles, (2) rural areas in humid regions where the
<br />upstream drainage ha.qin exceeds 100 square miles. (:~) rural areas in semiarid regions where
<br />the upstream drainage basin exceeds 250 square miles, and (4) smaller drainage basins.
<br />dej.wnding on topography and potential use of the flood plains.
<br />Thf' 89th ConKrt.'gs. in HOllse Document 46;'). recommendpd the preparation of flood-prom>
<br />an'a ma~lM to assist in minimizing noon lo~sf"S by quiekly identifying the areas of pot€'ntial
<br />flood hazards. Mort' detailed flood information may be required for otht>r purposes sllch
<br />as structural desil{lls. economic studies. or formulation of land:~use regulations. Such de.
<br />tuilt'd information may be obtained from the u.s. Geological Survey, other Federal agelwit.->s,
<br />or State. local, and pl'ivat€' ageneies.
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<br />1 ~ 0
<br />ESF;::L..:=:::F ,=--:r--:~ -1::- 'E;=~. . ., F','::,- _ .-:-=-___ ~ -~ "==='-=
<br />1000 0 1000 2000 3000 4000 5000 6(X)(l 7000 FEEt
<br />f3::~. mE. :r::.-==---.::.~"::':~._ ___ r.-___.~ ~- =::J
<br />1 5 0 1 KILOMETf.R
<br />E::T-"-=;'~.:--.:':::E3:.:~~:r:::'i:~~'::::"'~~ _~:;-='?"'Jj
<br />CONTOUr~ INTERVAL 40 FEET
<br />DOTtLD UN[S R[PRFSrNT 70 FOOT CONTOURS
<br />DATUM is MlAN Sf.A LEVEL
<br />This work was performed by the U.S. Geologica! Survey for
<br />and funded by the Federal Insurance Administration.
<br />Department of Housing and Urban Development, to meet
<br />provisions of the National Flood Insurance Act of 1968.
<br />
<br />J MILE
<br />~
<br />
<br />EXPLANATION
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<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations.
<br />
<br />COLORADO
<br />
<br />QUADRANGLE LOCATION
<br />
<br />BASALT. COLO,
<br />N3915 W10700/75
<br />Base by U.S. Geological Survey
<br />1961
<br />
<br />1974
<br />
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